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 <h1>接口</h1>
<h2>目录</h2><ul class="chunklist chunklist_part"><li><a href="class.countable.html">Countable</a></li><li><a href="class.outeriterator.html">OuterIterator</a></li><li><a href="class.recursiveiterator.html">RecursiveIterator</a></li><li><a href="class.seekableiterator.html">SeekableIterator</a></li></ul>


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  <p class="para">SPL 提供一系列接口。</p><p class="para">可参考<a href="reserved.interfaces.html" class="xref">预定义接口和类</a>。</p>

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   <h2 class="title">接口列表</h2>
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    <li class="member"><span class="classname"><a href="class.countable.html" class="classname">Countable</a></span></li>
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